U.S. patent application number 10/995739 was filed with the patent office on 2005-05-26 for setting tool.
Invention is credited to Dittrich, Tilo, Ehmig, Gerhard, Gantner, Gebhard.
Application Number | 20050109812 10/995739 |
Document ID | / |
Family ID | 34530316 |
Filed Date | 2005-05-26 |
United States Patent
Application |
20050109812 |
Kind Code |
A1 |
Ehmig, Gerhard ; et
al. |
May 26, 2005 |
Setting tool
Abstract
A combustion power-operated setting tool, includes a setting
mechanism (12), and a safety device (30) for preventing a setting
process upon an operational temperature of the setting mechanism
(12) exceeding a predetermined threshold temperature, with the
safety device (30) including a temperature-sensitive servo element
(31) having a first position (32) when the operational temperature
of the setting mechanism (12) is below the predetermined threshold
temperature and in which a setting process with the setting tool
(10) can be carried out, and a second position (33) when the
operational temperature of the setting mechanism exceeds the
predetermined threshold temperature and in which the setting
process cannot be carried out.
Inventors: |
Ehmig, Gerhard; (Rankweil,
AT) ; Dittrich, Tilo; (Gams, CH) ; Gantner,
Gebhard; (Nenzing, AT) |
Correspondence
Address: |
DAVID TOREN, ESQ.
SIDLEY, AUSTIN, BROWN & WOOD, LLP
787 SEVENTH AVENUE
NEW YORK
NY
10019-6018
US
|
Family ID: |
34530316 |
Appl. No.: |
10/995739 |
Filed: |
November 22, 2004 |
Current U.S.
Class: |
227/8 ;
227/10 |
Current CPC
Class: |
B25C 1/143 20130101;
B25C 1/186 20130101; B25C 1/008 20130101; B25C 1/184 20130101 |
Class at
Publication: |
227/008 ;
227/010 |
International
Class: |
B25C 001/14 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 26, 2003 |
DE |
103 55 375.4 |
Claims
What is claimed is:
1. A combustion power-operated setting tool, comprising a setting
mechanism (12); and a safety device (30) for preventing a setting
process upon an operational temperature of the setting mechanism
(12) exceeding a predetermined threshold temperature, the safety
device (30) comprising a temperature-sensitive servo mechanism (31)
having a first position (32) when the operational temperature of
the setting mechanism (12) is below the predetermined threshold
temperature and in which a setting process with the setting tool
(10) can be carried out, and a second position (33) when the
operational temperature of the setting mechanism exceeds the
predetermined threshold temperature and in which the setting
process cannot be carried out.
2. A setting tool according to claim 1, wherein the safety device
(3) comprises a locking member (34) that cooperates with the servo
mechanism (31) and is displaced thereby, upon the operational
temperature of the setting mechanism (12) exceeding the threshold
temperature, from a release position (37) thereof in a locking
position (36) thereof in which it lockingly engages a displaceable
functional element of the setting tool (10), and is displaced by
the servo mechanism (31), upon the operational temperature of the
setting mechanism (12) being below the threshold temperature, from
the locking position (36) thereof into the release position (37)
thereof in which it becomes disengaged from the functional
element.
3. A setting tool according to claim 2, wherein the servo mechanism
(31) comprises a temperature-sensitive servo member (35).
4. A setting tool according to claim 3, wherein the
temperature-sensitive servo member (35) is formed at least
partially of a memory metal.
5. S setting tool according to claim 3, wherein the
temperature-sensitive servo member (35) is formed at least
partially of a bi-metal.
6. A setting tool according to the claim 3, wherein the
temperature-sensitive servo element (35) biases the locking member
(34) in a direction of its locking position (36) upon the
operational temperature of the setting mechanism exceeding the
threshold temperature.
7. A setting tool according to claim 6 wherein the
temperature-sensitive servo element (35) biases the locking member
(34) in the direction of its locking position (36) against a
biasing force of at least one spring (39).
8. A setting tool according to claim 3, wherein the
temperature-sensitive servo element (35) is formed as a spring made
entirely of the memory metal.
9. A setting tool according to claim 3, wherein the
temperature-sensitive servo element (35) is formed as a memory
metal wire.
10. A setting tool according to claim 2, wherein the functional
element is formed as a press-on member (19).
11. A setting tool according to claim 2, wherein the functional
element is formed as firing pin (17).
12. A setting tool according to claim 2, wherein the functional
element is formed as a cartridge strip (40).
13. A setting tool according to claim 2, wherein the functional
element is formed as a fastening element strip (50).
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a combustion power-operated
setting tool including a setting mechanism and a safety device that
prevents a setting process from being carried out when an
operational temperature of the setting tool or the setting
mechanism exceeds a predetermined threshold temperature.
[0003] 2. Description of the Prior Art
[0004] Setting tools of the type described above can be driven with
solid, gaseous, or liquid fuels or propellants. During a setting
process, a setting piston of a setting tool, which is displaceable
in a piston guide, is driven by expanding gases produced by
combustion of a propellant. With the setting piston, fastening
elements can be driven in constructional components.
[0005] During combustion or a thermal conversion of a propellant, a
large amount of heat energy is produced, which leads to a strong
thermal loading of certain components of a setting tool. This leads
to functional disturbances during operation of the tool and an
increased wear of the tool components.
[0006] U.S. Pat. No. 6,123,241 discloses a combustion-engined
setting tool having a combustion chamber for combusting a gaseous
fuel. For monitoring the combustion chamber temperature, a
temperature sensor is provided. The obtained temperature data are
used for determining the amount of fuel that should be fed into the
combustion chamber in order to obtain an optimal combustion. When
the data lie outside of an acceptable range, a microprocessor turns
off the setting tool.
[0007] However, the timing of the turning-off of the setting tool
is not precisely defined.
[0008] A drawback of the known setting tool consists in that the
control with using a microprocessor is very expensive and
interference-prone because of occurring high reaction forces.
[0009] Accordingly, an object of the present invention is to
provide a setting tool of the type described above in which the
drawbacks of conventional setting tools are eliminated.
[0010] Another object of the present invention is to provide a
setting tool of the type described above characterized by a
reliable operation.
[0011] A further object of the present invention is a setting tool
of the type described above and which can be economically
produced.
SUMMARY OF THE INVENTION
[0012] These and other objects of the present invention, which will
become apparent hereinafter, are achieved by providing a setting
tool of the type described above and in which the safety device
includes a temperature-sensitive servo mechanism having a first
position when the operational temperature of the setting tool or
the setting mechanism is below the predetermined threshold
temperature and in which a setting process with the setting tool
can be carried out, and a second position when the operational
temperature of the setting tool and the setting mechanism exceeds
the predetermined threshold temperature and in which the setting
process cannot be carried out.
[0013] The provision of such a temperature controlled pure
mechanical servo mechanism permits to prevent a setting process
upon overheating of the setting tool in a simple and reliable way.
The servo mechanism is very-robust, hardly susceptable to wear, and
insures a long service life of the setting tool. Another advantage
of the inventive servo mechanism consists in that the locking
function cannot be altered by some manipulation.
[0014] In a particularly stable embodiment of the setting tool, the
safety device has a locking member that cooperates with the servo
mechanism and is displaced thereby, upon the operational
temperature of the setting mechanism exceeding the threshold
temperature, from its release position into its servo position in
which it lockingly engages a displaceable functional element of the
setting tool, and is displaced by the servo mechanism, upon the
operational temperature of the setting mechanism being below the
threshold temperature, from its locking position into its release
position in which it becomes disengaged from the functional
element.
[0015] The functional element, as a result of its engagement by the
locking member either becomes immovable, or its displacement in the
setting tool is blocked by the servo mechanism. The functional
element, within the meaning of the invention, can be represented by
all of the constructional or accessory components of the setting
tool necessary for carrying out a setting process.
[0016] The functional element can, advantageously, be represented,
e.g., by a press-on member that forms part of a safety chain of a
setting tool. The setting process is reliably prevented by locking
or blocking of the safety chain by immobilizing the press-on
member.
[0017] It could be convenient to use the firing pin or a least a
component of an ignition chain as a functional element. Here,
likewise, the setting process is reliably prevented by blocking or
locking the firing pin or the ignition chain.
[0018] The functional element can also be formed by a catridge
strip. The setting process then can be reliably prevented by
interrupting or blocking the delivery of a new catridge or
propellant to the catridge socket or the combustion chamber of a
setting tool.
[0019] The functional element can also be formed by a fastening
element strip. The inventive setting tool includes a safety
mechanism that prevents a setting process in the absence of a
fastening element in the receptacle in which the fastening element
is lodged before being driven in. Such a safety mechanism reliably
prevents a following setting process by interrupting or blocking
the delivery of a fastening element in its receptacle in the outlet
part of the setting tool.
[0020] Advantageously, the temperature controlled servo mechanism
has a temperature-sensitive servo element. With this servo element,
in a simple manner, an increase of the temperature of the setting
tool or the setting mechanism above the threshold temperature can
be reliably determined, with conversion of the temperature increase
directly into the displacement of the servo element. Also, the
reduction of the temperature below the threshold temperature can be
detected and transformed in the displacement of the servo element.
Advantageously the temperature-sensitive servo element biases the
locking member in a direction of its locking position upon the
operational temperature of the setting mechanism exceeding the
threshold temperature.
[0021] Advantageously, the temperature sensitive servo element is
formed at least partially of a memory metal. The advantage of
forming the servo element of a memory metal consists in that its
length or shape momentarily changes at switching point
temperature.
[0022] Ideally, the switching point temperature corresponds to the
threshold temperature for turning off or locking of the setting
tool. This can be achieved by a well-aimed adjustment of the memory
metal alloy.
[0023] Advantageously, other temperature-sensitive actuators, e.g.,
of bi-metals or certain mineral materials can be used as servo
elements. Such servo elements have a constant displacement at
increased or decreased temperature.
[0024] It is convenient when the temperature-sensitive servo member
biases the locking member in the direction of its locking position
against a biasing force of at least one spring.
[0025] The spring faciliates return of the servo mechanism into its
release position. In particular, when an servo element of a memory
metal is used, changing of its shape or reduction of its length,
upon the reduction of the temperature below the threshold or
switching point temperature, is initiated and accelerated by the
spring.
[0026] It is convenient when the temperature-sensitive servo
element is formed as a spring made of a memory metal. The spring
can be formed as a memory metal tension or compression spring. By
forming the servo element as a spring, the constructional length of
the servo mechanism can be reduced.
[0027] It can be advantageous to form the servo element as a memory
wire. In this case, a particularly large operational path of 3-4%
of the length of the memory metal wire can be achieved.
[0028] The novel features of the present invention, which are
considered as characteristic for the invention, are set forth in
the appended claims. The invention itself, however, both as to its
construction and its mode of operation, together with additional
advantages and objects thereof, will be best understood from the
following detailed description of preferred embodiments, when read
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The drawings show:
[0030] FIG. 1 a partially cross-sectional side view of a setting
tool according to the present invention which is pressed against a
constructional component;
[0031] FIG. 2 a cross-sectional view along line II-II in FIG.
1;
[0032] FIG. 3 a partially cross-sectional side view of the setting
tool shown in FIG. 1 in a condition in which it is not pressed
against a constructional component;
[0033] FIG. 4 a cross-sectional view along line IV-IV in FIG.
3;
[0034] FIG. 5 a longitudinal cross-sectional view of a first
embodiment of a temperature-sensitive servo mechanism in its
locking position;
[0035] FIG. 6 a cross-sectional view of the servo mechanism shown
in FIG. 5 in its release position;
[0036] FIG. 7 a longitudinal cross-sectional view of a further
embodiment of an servo mechanism in its locking position;
[0037] FIG. 8 an end, partially cross-sectional view of the
temperature-sensitive servo mechanism shown in FIG. 7 in the
locking position of the mechanism;
[0038] FIG. 9 an end, partially cross-sectional view of the
temperature-sensitive servo mechanism shown in FIG. 8 in a release
position thereof;
[0039] FIG. 10 a partially cross-sectional longitudinal view of a
still further embodiment of a temperature sensitive mechanism in a
release position thereof;
[0040] FIG. 11 a longitudinal, partially cross-sectional view of
the servo mechanism shown in FIG. 10 in its locking position;
[0041] FIG. 12 a partially cross-sectional, longitudinal detail
view of another embodiment of a setting tool according to the
present invention in a condition in which the setting tool is
pressed against a constructional component;
[0042] FIG. 13 a partially cross-sectional, longitudinal, detail
view of the setting tool shown in FIG. 12 in a condition in which
it is not pressed against a constructional component.
[0043] FIG. 14 a partially cross-sectional, longitudinal, detail
view of yet another embodiment of a setting tool according to the
present invention in a condition in which the setting tool is not
pressed against a constructional component;
[0044] FIG. 15 a partially cross-sectional, longitudinal, detail
view of still another embodiment of a setting tool according to the
present invention in a condition in which the setting tool is
pressed against a constructional component; and
[0045] FIG. 16 a partially cross-sectional longitudinal, detail
view of the setting tool shown in FIG. 15 in a condition in which
it is not pressed against a constructional component.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0046] FIGS. 1 through 6 show a first embodiment of a setting tool
according to the present invention. The setting tool 10 includes a
housing 11 and setting mechanism 12 arranged in the housing 11. The
setting mechanism 12 includes a piston guide 14 in a hollow chamber
15 of which, a setting piston 16 is displaceably arranged. The
setting piston 16 is displaced by a propellant, e.g., in form of a
cartridge 41 or by expandable combustion gases of the cartridge 41.
At the rear end of the piston guide 14, there is provided a
cartridge socket 18 for receiving the cartridge 41. The cartridges
41 are arranged on a cartridge strip 40 that is displaceable in a
channel 42 formed in the setting tool 10. In front of the housing
11 and the piston guide 14, there is arranged an outlet member 13
from which sidewise, a magazine 20 with fastening elements
projects. The outlet member 13 is supported against the housing 11
by at least one spring member 21. The outlet member can be
supported directly against the piston guide 14. The spring member
21 surrounds a bar-shaped press-on member 19 that is secured to the
press-on member 19. The piston guide 14 is displaceable in a guide
22 provided in the piston guide 14. The press-on member 19 forms
part of a safety chain that should prevent actuation of the setting
tool when the setting tool is not pressed with outlet member
against the constructional component in the setting direction 65.
The press-on member 19 has a section formed as an entrainment
member 26 that engages, in the positions of the setting tool shown
in FIGS. 1 and 3, in a recess 27 formed in a firing pin 17
displaceable in a firing pin guide 17.1. The firing pin 17 is
supported at its end remote from the cartridge socket 18 against
the housing 11. The firing pin 17 is supported against the housing
11 by a spring 28.
[0047] In the position shown in FIG. 1, the setting process can be
initialed by actuation of the actuation switch 23 provided on the
handle of the setting tool 10. Mechanical connection means (not
shown) can connect the actuation switch 23 with the entrainment
member 26 so that the latter would pivot out from the recess 27,
releasing the firing pin 17 can be displaced towards the cartridge
41.
[0048] During a lasting operation, the setting tool 10 and
primarily, the setting mechanism 12 become strongly heated. In
order to prevent overheating of the setting tool or of the setting
mechanism during operation of the setting tool and to prevent
damage of the tool and harm to the tool user, there is provided on
the tool a safety device generally designated with a reference
numeral 30 which is particularly shown in FIGS. 2 and 4.
[0049] The safety device 30 includes an servo mechanism 31 that
reacts to the temperature of the setting tool 10 and the setting
mechanism 12 and the construction of which will be described more
precisely further below. The servo mechanism 31 is arranged
sidewise of the piston guide 14 and is pivotally connected by a
transmission member 38 with a locking member 34 that is formed as a
locking pawl. The locking member 34 is pivotally supported on a
hinge support 34.1.
[0050] In FIG. 2, the servo mechanism 31 is shown in its first
position 32 in which the servo mechanism 31 permits operation of
the setting tool 10 and the setting mechanism 12 the temperature of
which has not yet exceeded the threshold temperature. In the first
position 32, the locking member 34 is its release position 37 in
which it is withdrawn from a recess 29 formed in the press-on
member 19. This provides for displacement of the press-on member 19
in direction 60 (see FIG. 1) and loading of the firing pin 17.
[0051] FIG. 4 shows the servo mechanism 31 in its second position
33 which the servo mechanism 31 assumes in response to a too high
temperature of the setting mechanism 12. In the position 33, the
servo mechanism 31 blocks the setting tool 10 from carrying-out a
setting process. To this end, the servo mechanism 31 displaces the
transmission member 38 in direction 61, pivoting the locking member
34 about the hinge support 34.1 in a direction 62 into its locking
position 36. As a result, the locking member 34 engages with its
free end in the recess 29 in the press-on member 19, as shown in
FIGS. 3-4. In this position of the servo mechanism 31, the press-on
member is located in its initial position in which the outlet
member 13 is spaced from the housing 11 and does not stress or load
the firing pin 17.
[0052] FIGS. 5-6 show in detail the servo mechanism 31 of the
setting tool 10. The servo mechanism 31 has an elongate housing 24
in which an servo element 35, which is formed as a memory metal
wire, is arranged for displacement parallel to the longitudinal
extent of the housing 24. At one of its end the servo element 35 is
fixedly secured to the housing 24 and is connected, at its opposite
end, to the transmission member 38 that partially projects from the
housing 24. Between a shoulder 24.1 formed in the housing 24 and
the transmission member 38, there is arranged a spring 39 that is
formed as a tension spring and biases the transmission member 38
and the servo member 35 towards the first position 32 of the servo
mechanism 31 (see FIG. 6).
[0053] When, upon overheating of the setting tool 10, the servo
element 35 is heated above a predetermined threshold or operating
position temperature, the memory metal wire jumps out, displacing
the transmission member 38 in the direction 61, and thereby
displacing the servo mechanism 31 in its second blocking position
33 (FIG. 5). In the second position 33 of the servo mechanism 31,
the locking member 34 is held in its locking position 36 by the
servo mechanism 31 and its transmission member 38 (see FIG. 4).
[0054] Upon cooling of the setting tool 10 and of the settling
mechanism 12, the servo element 35 is also cooled down. The spring
39 then becomes released after the servo element 35 of memory metal
wire reaches its restoring temperature and assumes its original
dimension. The transmission element 38 moves in direction 63 back
into the housing 24, and the servo mechanism assumes its first
position 32 in which the locking member 34 is held by the servo
mechanism 31 and the transmission member 38 in its release position
37 (see FIG. 2).
[0055] In summary, the servo element 35 performs the following
functions: temperature measurement (continuous, absolute),
comparison of the temperature with the threshold temperature,
carrying-out the locking function, comparison of the temperature
with the restoring temperature, and release of the locking
condition. The presetting of the threshold temperature, of the
restoring temperature, and of the hystersis value can be effected
by a predetermined selection of the memory metal.
[0056] A further embodiment of an servo mechanism according to the
present invention is shown in FIGS. 7-9. The servo mechanism, which
is shown in FIGS. 7-9 has a bi-metal spiral that forms the servo
element 35 arranged in the housing 24. One end of the servo element
35 is fixedly connected with the housing 24. The other, opposite
end of the servo element 35 is secured to the transmission member
38 rotably arranged in the housing 24. The transmission member 38
has a circular section 38.4 on the circumferential surface of
which, there are provided indentations 38.2 which cooperate with a
locking device 38.1. Upon heating of the setting tool 10 or of the
setting mechanism 12, the end of the servo element 35, which is
connected with the transmission member 38, would rotate as a result
of heating of the servo element. However, the transmission member
38 is held in its first position 32 by the locking device 38.1.
Only after a certain temperature, which exceeds the predetermined
threshold temperature, the torsional force, which is produced by
the servo elements, becomes large enough to rotate the transmission
member 38 in direction 69 (see FIG. 9) against the holding force of
the divice 38.1, displacing the transmission member 38 from its
first position 32 to its second position 33. The locking device
38.1 then engages in the second indentation 38.2, retaining the
transmission member 38 in its second position 33. Upon cooling of
the setting tool 10 or the setting mechanism 12, the servo element
35 rotates in the opposite direction, and again, when a
predetermined temperature is reached, the torsional force of the
servo element 35 becomes so high that it provides for rotation of
the transmission member 38 in direction 68 (see FIG. 8), with the
locking device 38.1 being forced out of the indentation 38.2. The
transmission member 38 and with it, the servo mechanism 31 are
displaced back into the first position 32. The servo mechanism 31,
which is shown in FIGS. 7-9 can also be used in the setting tool
shown in FIGS. 1-4. It is believed it would be superfluous to
describe the operation of the servo mechanism 31 of FIGS. 7-9 in
the setting tool 10 and, therefore, the reference is made to
description made with reference to FIGS. 1-4.
[0057] A still further embodiment of the servo mechanism is shown
on FIGS. 10-11. In the embodiment show in FIGS. 10-11, the servo
element 35 is formed as a memory metal tension spring that is
arranged in a good heat-conducting housing section 24.2 of the
housing 24 of the servo mechanism 31. One end of the servo element
35 is again fixedly connected with the housing 24 or the housing
section 24.2, whereas the other, opposite end of the servo element
35 is secured to the transmission member 38 that is formed as a
two-arm lever. Specifically, the other end of the servo element 35
is secured to a lever arm 38.5 located in the housing 24. In the
housing 24, there is also arranged a spring 39 formed as a tension
spring and having one of its ends secured to the housing 24 and the
other of its ends secured to the same lever arm 38.5 of the
transmission member 38 to which the other end of the servo element
35 is secured. As a result, the pull direction of the spring 39 is
opposite to the pull direction of the servo element 35. The
transmission member 38 is supported in the housing 24 on a hinge
bearing or support 38.3. Stops 25, which are provided in the
housing 24, limit the possible pivotal path of the transmission
member 38. In FIG. 10, the servo mechanism 31 is located in its
second position 33 in which the memory metal tension spring that
forms the servo member 35, has a reduced length as a result of the
temperature of the setting tool 10 or the setting mechanism 12
exceeding a threshold temperature. Because of the reduced length of
the servo element 35, the spring 39 is stretched and is, thus,
preloaded. A setting tool, which is provided with a servo mechanism
31 shown in FIGS. 10-11, occupies, in the position of the servo
mechanism shown in FIG. 10, a non-operational position.
[0058] Upon cooling of the setting tool or of the setting
mechanism, the spring 39 releases the servo element 35 after the
restoring temperature is reached. The transmission member 38 pivots
to its first position 32 or to its initial position. In this
position of the servo mechanism 31, effecting a setting process
with a setting tool is possible. The servo mechanism 31, which is
shown in FIGS. 10-11, can also be used in the setting tool shown in
FIGS. 1-4. It is believed it would be superfluous to describe the
operation of the servo mechanism 31 of FIGS. 10-11 in the setting
tool 10 and, therefore, the reference is made to description made
with reference to FIGS. 1-4.
[0059] With reference to FIGS. 12-16, other embodiments of a
setting tool would be described and in which other locations of the
safety device according to the present invention are illustrated.
With regard to reference numerals not referred to below, reference
should be made to the description of the setting tool made with
reference to FIGS. 1-4.
[0060] In the setting tool 10, which is shown in FIGS. 12-13, the
safety device 30 is located in the region of the outlet member 13.
The locking member 34 is formed as a cylindrical body displaceable
in a guide 34.2. The locking member 34 can be displaced by the
servo mechanism 31, upon the temperature of the setting tool or the
setting mechanism exceeding the threshold temperature, from its
release position 37, shown in FIG. 12, to its locking position 36,
shown in FIG. 13 and in which, the locking member 34 engages
lockingly a fastening element strip 50 located in the magazine 20.
The engagement of the fastening element strip 50 by the locking
member 34 prevents displacement of the fastening element strip 50
in the displacement direction 66. Thus, after a setting process, no
fastening element 51 can be transported into the receiving chamber
13.1 of the outlet member 13. Thereby, sensor means 47, which is
provided on the outlet member 13, remains in a locking position 46
in which it engages a stop 11.1 provided in the housing 11 or
engages directly the piston guide 14. In this position 46, pressing
of the setting tool 10 against a constructional component is
prevented, and the press-on member 19 cannot be pushed back into
the setting tool. In this safety position of the fastening element
strip 50, effecting a setting process is not possible.
[0061] In the setting tool 10 shown in FIG. 14, the safety device
30 is arranged in the region of the setting took, with the locking
member 34, which is displaceable in the guide 34.2, lockingly
engaging the firing pin 17. In the locking position 36 of the
locking member 34, which is shown in FIG. 14, actuation of the
setting tool is not possible because the firing pin 17 cannot be
displaced to its loading position in which the spring 28 is
compressed.
[0062] In the setting tool shown in FIGS. 15-16, the safety device
30 is arranged adjacent to channel 42 in which the cartridge strip
40 with cartridges 41 is displaceable. The locking member 34 is
displaceable in the guide 34.2 that is open toward the channel 42.
In the release position 37 of the locking member 34 which is shown
in FIG. 15, the locking member 34 is pulled out of the channel 42,
and the cartridge strip 40 can be displaced in the direction 67.
When the temperature of the setting tool 10 or of the setting
mechanism 12 exceeds the threshold temperature of servo mechanism
31, the locking member 34 is displaced by the transmission member
38 of the servo mechanism 31 into its locking position 36 shown in
FIG. 16. In the locking position 36, the locking member 34
lockingly projects into the channel 42, and the cartridge strip
cannot be displaced in a direction 67. Likewise, the cartridge
strip 40 can be inserted into the channel 42 from the opposite side
64. In the upper region of the channel 42, there is provided a
locking pawl 43 supported in the setting tool 10 on a hinge bearing
or support 45. The pawl 43 is pressed into the channel 42 by a
spring 44, blocking the displacement of the cartridge strip 40 from
above in the direction 64. In the displacement direction 67, the
locking pawl 43 can be displaced out of the channel 42 because of
an inclination ramp 43.1.
[0063] Though the present invention was shown and described with
references to the preferred embodiments, such are merely
illustrative of the present invention and are not to be construed
as a limitation thereof, and various modifications of the present
invention will be apparent to those skilled in the art. It is,
therefore, not intended that the present invention be limited to
the disclosed embodiments or details thereof, and the present
invention includes all variations and/or alternative embodiments
within the spirit and scope of the present invention as defined by
the appended claims.
* * * * *